This video is part of VICE Japan’s series 密着２４時 (micchaku nijuuyonji) or “A Day With…” series where they basically find someone interesting and follow them around for a day.
This particular video focuses on someone who might just be Hatsune Miku’s biggest fan.
Given his extreme interest in all things Miku, Gonta is a surprisingly sane, well adjusted person. Though the blue-haired character is a big part of his life, he sees her as a hobby or interest rather than a real person or substitute for a girlfriend.
Hopefully one day he can find a girl who loves Miku (almost) as much as he does, I’m sure they would be very happy!